Steam generating plant indirectly heated by alpha circulating heat carrier



O.ENGLER L Z STEAM GENERATING PLANT INDIRECTLY HEATED BY A CIRCULATINGHEAT CARRIER Feb. 23, 1932.

Filed JulylS, 1931 Fig. 1.

0x1 052 28? flz forz yi RFQL Patented Feb. 23, 1932 warren stars e OTTOENGLEB, F KASSEL-WILHELEISHOHE, GEEIVIANY, ASSIGNOB TO SCHIdIDTSCHEHEISSDAMPF-GESELLSCHAFT MIT BESCHRANKTEB, IIAFTUNG, OFKASSEL-WILHE'LIVI- SEOHE, GERMANY STEAM. GENERATING PLANT INDIRECTLYApplication filed July 13, 1931, Serial No.

My invention relates to steam generating plants, in which a circulatingheat carrier is utilized for the indirect generation of steam, saidsteam generating plant having boiler drums which are situated one on a vhigher level than the other. The object of the invention is to provide asteam generating plant of this kind especially suitable for high output,requiring relatively little space though containing a large heatingsurface, and having in the boiler drums a large feed space and a highwater capacity, to provide for variations in output. For these purposesthe water spaces of two drums, being interconnected, are arranged insuch a manner, according to the invention, that only the upper drum hasan adjustable water level, while the lower drum is totally or next tototally filled with water. As the water space i in the lower drum takesup practically the whole drum it is possible to locate in this waterspace an exceptionally lar e heating surface being traversed by theheating medium. Even high fluctuations of the water 'level occurring inthe upper drum will not affect the heating surface in the lower drum.Therefore, with the new boiler, much higher variations of the waterlevel are permissible and the heat storage capacity of the boiler watercan be utilized to a much higher extent than with ordinary boilerswhereeach drum has an adjustable water level. The various objects of theinvention will be more clearly apparent from a reading of thespecification and claims together with the accompanying drawings.

In the drawings an example of the present invention is shown. Fig. 1 isa longitudinal section through the two boiler drums lying one on top ofthe other. Fig. 2 is a cross section on line IIII and Fig. 3 a crosssection ondine IIIIII of Fig. 1.

In the upper drum 1 are located the heating elements 2, in the lowerdrum the heating elements 4. The heating elements are inserted throughthe manholes provided on both ends of the drum, the elements lying endto end in pairs. As the lower drum is always practically filled withwater, a very large heating surface can be located in this drum.

ing surface.

HEATED BY A GIRCULATING HEAT CARRIER 550,589, and in Germany July 21,1930.

In the example illustrated thisis shown by drum only two elements 2arelying side by side. Still it is possible to locate the total Iheating surface in the lower drum keeping theupper drum free fromheating elements.

Each individual heating element comprises an inlet header 2 resp. l, anoutlet header 2 resp. et bent tubes connecting both headers.

The steam flows to the inlet header from the the heated coils of theclosed cir- Quit not shown in the drawings,'through the pipe 5, and thecondensate generated in the heating elements flows back from the. outletheader through the pipe 6-to the heated coils -This construction of theclosed circuit is hnown and need not be further explained iere. r

In the upper drum'there is an adjustable water level, offering arelativelylarge steam- ,The water spaces of the two drums land 3 areconnected by pipes 9. At the crown of the lower dru nS steam pipes areconnected, opening into the steam space of druml. Above the outlet ofthese pipes 10 a baffle plate 11 is arranged in order to separate thewater entrained from the lower drum by the flow of steam. The steamcoming from the lower drum mixes with the steam generated in the upperdrum. Steam is drawn off by the steam valve 12. In the steam space ofthe upper drum dripping plates are arranged, by means of which the feedwater entering tl1I'0ll 'l1 thepipes 14 is preheated and deaerated. Fromthe dripping plates the feed water is led to the bottom of the lowerdrum by pipes 15. The upper drum is notfed directly; feed water issupplied to the upper drum from the lower drum by the pipes 9. j

As, according to the invention, the greater portion of theheatingsurface or, as the case may be, the whole heating surface is located inthe lower drum, this lower drum being constantly filled with water, theheating surface will be permanently covered by Water even in case thereare very high fluctuations of the water level in the upper drum. 7 Theheating surface in the upper drum being comparlot 7 most lively motion,owing to the large heat- 1ng surface contained in this drum. Steamgeneration is very vivacious and 'the impurities precipitated areentrained with the steamto the crown of the drum, where steam is takenoff to the upper drum. The steam flowing to the upper drum entrainsgreat quantities of fluid and impurities to the upper drum, as has beenshown by tests. In the upper drum the water is comparatively quiet.Therefore impurities can deposit here. By these means a substantialadvantage for the continuous working of the indirectly heated boiler isobtained, the lower drum remaining free from deposits and the transferof heat not being impaired. Priming of water from the lower drum to theupper drum is not detrimental as the steam space in the upper drum canbe so large that the steam drawn 01f will be dry with certainty in anycase.

Having described -my invention, what I claim asnew and desire tosecure-by Letters Patent of the United States is as follows 1. In asteam generating plant indirectly heated by a circulating heat carriertwo boiler drums one being situated ona higher level'than the other,pipes connecting the water spaces of the two drums, an adjustable waterlevel only inthe upper drum, pipes leading from the upper part of thelower drum to the steam spaceof the upper drum and heating elements'forheating the water contents of the drums, the major part of the heatingelements lying in the lower drum.

2. In a steam generating plant indirectly heated by a circulating heatcarrier two boiler drums one being situated on a higher level than theother, pipes connecting the water spaces of the two drums, an adjustablewater level only in the upper drum, heatingelements located in thelower-drum and pipes leading from the upper part of the lower drum tothe steam space of the upper drum. 3. In a steam generating plant asclaimed in claim 1 dripping plates arranged in the steam space of theupper drum and feed water pipes leading to these dripping plates.

In testimony whereof, I have hereunto set I my signature.

' OTTO ENGLER.

